福建农林大学学报（自然科学版）2007，Vol.36Issue(5)：525-531,7.
入侵植物水葫芦对不同酸度条件的适应性
Adaptation of the invasive plant water hyacinth ( Eichhornia crassipes ) to different acidic conditions
摘要
Abstract
In order to reveal the adaptation of water hyacinth at different acidity conditions, a six-week experiment, using mesocosm tanks with Hoagland's solutions, was set up in a greenhouse to investigate the adaptation of the plant exposed to different acidity conditions (pH 3.5, 5.0, 7.0, 9.0 and 11.0). The results showed that water hyacinth was able to grow in hydroponic solution at pH from 3.5 to 11.0. The relative growth rates of the plant ranged from 6.12 to 3.08 and declined as the pH level increased. Plant height, leafstalk length, leaf length, leaf width and leaf thickness of water hyacinth did not vary significantly at the range of pH 3.5 to 9.0, while root length, stolon length and root vigor declined obviously with the increasing pH. Bio-chemical analysis showed that soluble protein decreased and malondildehyde (MDA) contents changed slightly in leaves, but no significant difference was found among the five treatments. However, at basic conditions, the higher CAT, POD activities and MDA contents, as well as the imbalance between CAT, POD and SOD in roots were found, implying that the plant could not remove activated oxygen successfully and injured by radicals. The higher root vigor and relative growth rates of water hyacinth at acidic conditions than base one suggested that the plant preferred to acidic conditions. As a result, the survial of water hyacinth at a large range of pH and preferred to acidic conditions must be one of key factors for its spreading out the aquatic system in south China.关键词
水葫芦/酸胁迫/根系活力/SOD/CAT/POD/MDAKey words
water hyacinth (Eichhornia crassipes)/ acidity stress/ root vigor/ superoxide dismutase (SOD)/ catalase (CAT)/guaiacol-peroxidase (POD)/ malondildehyde (MDA)分类
农业科技引用本文复制引用
林瑞余,陈天生,王兵,林文雄..入侵植物水葫芦对不同酸度条件的适应性[J].福建农林大学学报（自然科学版）,2007,36(5):525-531,7.基金项目
福建省科技厅资助项目(2004N073,2005K039). （2004N073,2005K039）
